Redox flow battery cell stack



FIG. 1 is a perspective view of a redox flow battery cell stack showing my new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a right side view thereof;

FIG. 5 is a top plan view thereof; and,

FIG. 6 is a referential perspective view showing an assemble state thereof.

The broken line showing is for illustrative purpose only and forms no part of the claimed design. 

CLAIM The ornamental design for a redox flow battery cell stack, as shown and described. 